Sega Mega Drive Ecco The Tides of Time Limited Edition

I have no idea how rare this is, except a lot. For the original Ecco, there is a Limited Edition from where Sega made a deal with a London aquarium which housed a real dolphin named Ecco (who would benefit from the proceeds). Not sure if there was any sort of similar deal with this set. However, it is missing the CD and T-Shirt which were originally included.